I wanted to let you know that you do not have to limit yourself to purchasing an extra USB cable from Best Buy Parts website. I just purchaed a 10' USB cable on EBay for $.99 plus $2.50 shipping!! I wanted to have an extra cable I could use at work. Plus I'm seriously considering purchasing a new car radio with a USB input on the front of it.

Here's how you can find the same cable I purchased.

Go to EBay and type this information in the search window: USB 2.0 HIGH SPEED A TO MINI B 5-PIN CABLE
*This should bring you to a couple of results. The seller I purchased my cable from is "Premiertek". Good luck and let me know how it works out for you.